Tropical Grasslands (2007) Volume 41, 253–259

Stylosanthes species in north-east Thailand: dry matter yields and seed production

M.D. HARE, P. TATSAPONG, S. PHENGPHET AND A. LUNPHA

Faculty of Agriculture, Ubon Ratchathani University, Ubon Ratchathani, Thailand

Abstract

A field experiment was conducted in north-east Thailand between 2003 and 2006 to compare dry matter yields of Stylosanthes hamata cv. Verano, S. guianensis cvv. Tha Phra, Ubon stylo and Temprano, and S. scabra cv. Seca. A second field experiment in 2004 compared the effect of closing date defoliation on subsequent seed yields of Tha Phra and Ubon stylo.
Ubon stylo and Tha Phra produced at least 90% more dry matter than Verano over 3 years, with advantages particularly obvious in the dry season, when they produced 2–6 times the yield of Verano. Ubon stylo and Tha Phra produced 13, 18 and 17 t/ha/yr DM, in the first, second and third years of production, respectively. Temprano produced intermediate dry matter yields, being generally inferior to Ubon stylo and Tha Phra, but superior to Verano and Seca. Both Ubon stylo and Tha Phra would be suitable replacements for Verano.
Ubon stylo produced 2.6 times the seed yield of Tha Phra (959 vs 365 kg/ha). Closing in September doubled seed yield over closing in October.
Management of perennial stylo pastures to increase the commercial use of stylo pastures is discussed. Ubon stylo’s stronger resistance to anthracnose, better grazing persistence and higher seed yields than Tha Phra, suggest it would be a better replacement for Verano.

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